• 제목/요약/키워드: Amidines

검색결과 7건 처리시간 0.02초

Reactions with Heterocyclic Amidines (V). Synthesis of some new imidazo[l, 2-b] pyrazole,pyrazolo[5,1-C]-1,2,4-triazine and pyrazolo [5, 1-c]-1,2,4-triazole derivatives

  • Ali Elagamey, Abdel Ghani;Ahmed Sowellim, Salah Zaki;Mohamed Nabil, Khodeir
    • Archives of Pharmacal Research
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    • 제10권1호
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    • pp.14-17
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    • 1987
  • Several new imidazo [1, 2-b] pyrazole, pyrazolo [5, 1-c]-1, 2, 4-triazine and pyrazolo [5, 1-c] triazole derivatives were prepared from the reaction of 3-antipyrinyl-5-aminopyrazole or its diazonium salt with .alpha.-chloroacetyl derivatives.

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Reactions with Heterocyclic Amidines $(Vl)^1$: Synthesis of some new sym. and assym. pyrazolotriazines and pyrazolo[4,5-e]pyrimidine derivatives

  • Ali Elagamey, Abdel Ghani
    • Archives of Pharmacal Research
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    • 제10권3호
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    • pp.173-178
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    • 1987
  • Several new pyrazolo [1, 5-a]-S-triazine, pyrazolo [4, 5, -elpyrimidine, pyrazolo [1, 5-a] pyrimidine derivatives were synthesized via condensation of 3-antipyrinyl-5-amino-pyrazole (2) with $\beta$$-bifunctional reagents. The azo analogues of pyrazolo [1, 5-a] pyrimidines ; i. e. pyrazolo [5, 1, c]-as-triazine and pyrazolo[5, 1, -c]-as-benzotriazine were synthesized by coupling of diazotized 2-with agents containing active hydrogen.

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A New Combined Source of "CN" from N,N-Dimethylformamide and Ammonia in the Palladium-Catalyzed Cyanation of Aryl C-H Bonds

  • Choi, Ji-Ho;Kim, Jin-Ho;Chang, Suk-Bok
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2011년도 제41회 하계 정기 학술대회 초록집
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    • pp.207-207
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    • 2011
  • Aromatic nitriles possess versatile utilities and are indispensible not only in organic synthesis but also in chemical industry. In fact, the nitrile group is an important precursor for various functional groups such as aldehydes, amines, amidines, tetrazoles, amides, and their carboxyl derivatives. Representative methods for the preparation of organonitriles with cyanide-containing reagents are the Sandmeyer and Rosenmund-von Braun reactions. Recently, a catalytic route to aryl nitriles has been reported on the basis of the chelation-assisted C-H bond activation or metal-catalyzed cyanation of haloarenes. In those cyanation protocols, the "CN" unit is provided from metal-bound precursors of MCN (M=Cu, K, Na, Zn), TMSCN, or K3Fe(CN)6. Additionally, it can be generated in situ from nitromethane or acetone cyanohydrin. Herein, we report the first example of generating "CN" from two different, readily available precursors, ammonia and N,N-dimethylformamide (DMF). In addition, its synthetic utility is demonstrated through the Pd-catalyzed cyanation of arene C-H bonds.

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Microwave Assisted Reaction of Condensed Thiophenes With Electron Poor Olefins

  • Al-zaydi, Khadijah M.;Elnagdi , Mohamed H.
    • 대한화학회지
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    • 제47권6호
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    • pp.591-596
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    • 2003
  • 아미노싸이에노피리다진(1a, b)과 아미노싸이에노쿠마린(2)은 DMFDMA와 축합반응을 하여 아미딘(3a, b)을 형성한다. 이 화합물들을 N-페닐말레이마이드와 반응시키면 화합물 9와 10이 얻어진다. 반면에 3a, b, 4, 18, 19, 20을 말레산 무수물과 반응시키면 포밀 유도체인 5a, b, 6, 21, 22, 23 들이 얻어진다. 아미딘 화합물 3a, b 를 다이에틸 퓨마레이트와 반응시키면 가수분해산물인 아미딘 14를 거쳐 11이 얻어진다. N-페닐말레이마이드를 마이크로웨이브 오븐에서 반응시키면 [2+2]와 [2+2+2] 고리첨가반응 산물이 얻어진다.